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So it's better to setup xend to use network-route script?
Philipp Jäggi wrote:

I would take the network-route for the wireless lan stuff and the network
nat on the firewall for every outgoing traffic, just to hide your
configuration. With your bridge in the front, everyone can see your whole
network config with a normal sniffer, what really is a security issue....

But it's almoust impossible to find good documentation about the nat and
route stuff.

Probably this mail thread can help you to get an idea about the problems of
such a configuration.